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Disallow unused placeholders in rule report messages (no-unused-placeholders)

✔️ The "extends": "plugin:eslint-plugin/recommended" property in a configuration file enables this rule.

This rule aims to disallow unused placeholders in rule report messages.

Rule Details

Reports when a context.report call contains a data property that does not have a corresponding placeholder in the report message.

Examples of incorrect code for this rule:

/* eslint eslint-plugin/no-unused-placeholders: error*/

module.exports = {
  create (context) {
    context.report({
      node,
      message: 'something is wrong.',
      data: { something: 'foo' },
    });

    context.report(node, 'something is wrong.', { something: 'foo' });
  },
};

Examples of correct code for this rule:

/* eslint eslint-plugin/no-unused-placeholders: error*/

module.exports = {
  create (context) {
    context.report({
      node,
      message: 'something is wrong.',
    });

    context.report({
      node,
      message: '{{something}} is wrong.',
      data: { something: 'foo' },
    });

    context.report(node, '{{something}} is wrong.', { something: 'foo' });
  },
};

When Not To Use It

If you want to allow unused placeholders, you should turn off this rule.

Further Reading